Emergency automobile brake



prix 13 ma.

EMERGENCY AUTOMOBILE BZAKE y Filed` Dec. 9, 1924 lll Patented Apr. 13, 1926.

UNITED STATES Artnr ori-rea FRANK POLLFRONE, OF BROOKLYN, NEW YORK.`

EMERGENCY AUTOMOBILE BRAKE.

Application led December 9, 1924. Serial No. 754,702. j

This invention relates generally to emeri gency means for. stopping automobiles, the invention having more par icular reference to means of this sortin which one or more drags "are dropped to the ground when the automobile is to be quickly stopped.

The invention has for an object the provision of a novel and improved device of this sort provided with positive actuating means for the drag that may be put in operation by the moving of a suitable hand lever.

F or further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention arc more particularly set forth.

Fig. 1 of the drawing is a plan view showing an automobile chassis having the invention applied thereto. 'p

Fig. 2 is a longitudinal lsectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view taken on the lineB--B of Fig. 1.

ln the drawing the front wheels of an automobile are indicated at 10 and the rear wheels at 11, the front and rear axles being indicated at 12 and 13 respectively, and the usual side Vframe members of the chassis at 14. According to my invention l attach to the front and rear axles drag members that are normally held in raised position and are lowered to contact with the ground Vwhen the automobile is to be quickly stopped. There are a front pair of these members, shown at 16 and a rear pair shown at 17. These members comprise approximately triangular arms that have curved outer ends which may be roughened as shown to more securely grip the ground.

The front members 16 vare pivoted to bracket elements or lugs -18 depending from the front axle, while the rear members are formed with apertures through which the rear axle passes, to pivot the said rear members upon the said rear axle, these members being retained against displacement' along Vbers 17 together;

the said rear axle by means of the collars 19 lined tothe latter, on opposite sides of the Y said members.

tion to the front end of the automobile when the device is put. into operation so as toV assistv in the quick stopping of the automobile. 1

The two front drag members 16 are connected together by a rigid crossbar 22, while a similar crossbar 23 connects the rear mem- These crossbars lhave pivotally attached thereto the `ends of a rigid, longitudinally extending link orvbar 24,'longitudinal movement of which acts to rEhe front members 16 are Vpreferably arranged to impart a lifting acswing the said members to operative position. This bar 24 is guided by means of transverse elements 26 fixed to the-chassis of the automobile and the said elements having apertures therein through which the bar passes freely, these apertures allowingI for a certain amount of vertical movement of the bar in addition to its longitudinal movement. The bar 24 is located in close adjacence to the drive shaft 27 of the automobile and has mounted thereof, between its ends to cause the said teeth to be projected tcward the said shaft and engage with a worm or thread element 30 on the said shaft. The sleeve 28 is free to rotate on the bar 24 and is held against longitudinal displacement with relation to the bar by means of collars 32 fixed to the bar at opposite ends of the sleeve.

The sleeve 28 is arranged to be given a partial rotation to bring the teeth 29 thereon into engagement with the worm 30 on the shaft 27 by the following means. Projecting from the sleeve, near opposite ends th ereof, are the arms 35 to the ends of which are secured a rod 36 that extends parallel to the sleeve. This rod passes through a slot 37 in the end of an arm 38 fixed to the rear end of a longitudinally extending rock-shaft 39 which has a bevel gear segment 40 fixed on its front end. This bevel gear segment 40 meshes with a like segment 41 on the lower end of a hand lever 42 that is fulcrumedto a supporting bracket 43 and prothe driver. Connected at one end to thisv lever` and at its other endto a projection from the b ae-het +13 is a tension spring 45 that acts to retain-the lever in position with the teeth on the sleeve turned away Jiroi'n the worm on the shatt.

tinueit-s journey by'manually backing,l samel oli the drag` members, .and to return the drag members to raisedy positron l may provide an expansion spring4 5t) ,that surroundsthe bar Ell and bears at one end en vone ot the Collars. and at its other end on one et the erossbarsQG.

Having' thus described my invention, what l elaim as new and desire to protect lby Letters Patent of the United States is as follo\vs:- i

l. In an automobile a normally elevated drag, adrive shaft, and means for establishing an Aoperative connection between the said drag andthe said shaft whereby the drag may be moved between raised and lowred positio-ns by rotation of the'saidV shaft, said means including worm on the `said shaft, a partially rotatable sleeve having` teeth thereon adapted to .be moved into and out of engagement with the worm on the shaft by rotation of the sleeve, and a bar on which A `loot pedal n a., be provided instead ot this hand lever,'iti desired.

downward `to engage the the sleeve ismouuted, said bar beingl eonneeted to the said drag and being arranged 'ifor longitudinal movement by and with the saidsleeve to move the said drag` between operative and inoperative position.

2. In an automobile, a pivotally mounted drag, a drive shaft, a yworn'i on the said drive shaft, a. bar eonneeted to the said drag, a sleeve rotatable on said bar but held against longitudinal displaeen'ientthereon,l teeth projeeting from one side of said sleeve and adapted to be moved into and out of engagenent with the said worm by rotary movement ot' the said sleeve, and means for rotating' the Said sleeve.

El. In an automobile, a pivotally mounted drag, a drive shaft, a worm on the said drive shaft, a bar connected to the said drag, a sleeve rotatable on said bar but held against longitudinal displaeement thereon, teeth projecting' from onel side ot said sleeve and Vr-d'apted to be moved into'a'ndout of engagement with Vthe ,said worm by rotary movement of the lsaid sleeve, and .means for rotating' the said sleeve, said means beirng` arranged tor n'ianual operation.

4.. in an automobile, a pivotally mounted drag', a drive shaft, a worm on said drive shajtft, a bar Connected to the said `drag to operate the lattera sleeve rotatable on said bar but held against longitudinal:displaceient thereon, teeth projecting from one side o't said sleeve, a pair of arms projectingv 'from said sleeve one near each end thereof, rod carried by the ends of the 'said arms and extending longitudinally oit the sleeve, a vroek shaft, -a-n arm vlined on Said shaft and having` a slotted end 'straddling the said rod, andV meansA `.for rocking' the id shaft.

'Intestimony whereof haveeiiixed my Signature.

FRANK POLLIFRONE. 

